Tool-steel-retaining device



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sept., 20,1927.

G, H. GILMAN TOOL STEEL RETAINING DEVICE Filed Dec( 31, 1919 'In the drawings:

Patented Sept. 20, 1927.

"GEORGE'IL KAGVILMA, OF CLAREMONT,-NEW HAMPSHIRE.

LTQQL-SraaI-mairllareDevice Appunti@ uga tegenin 3,1, Laia' ,serial No: new

,This invention relates .te tool, steel retaining devices 'espeeillyfadztpted'for use lininmer drills for other lilietools.v f

The invention will be best understood by referencel to the `following Y`deSeription when :taken 'in connection With theV aecompanying illustration of'one specific embodiment thereof, ,While its scope yvill Ibe more paitiaalrly Pointed @at ia ,appended .Claima- Figure l shows infront elevetionfthe for- War'd'end ef Vefhammer drill "machine equippedfvith :t toolgsteel reteiningV deyiee .embdyris Onefo'rmof the aveatbfl;

Fg- '2 i is' al longitudinal )central Satfin ,ofthe torna-.fd @Iid'fftha hammer (l1-ill H1@- chine `shown in Fig. 1, thesection being Y taken at rightangles ,to ythefview shown in l end on the line 2-'2 the/rein;

Fig, 3 is a transverse sectional elevation on the line `S-fin Fig-i`2; e t

'Figiy 4 shows an end elevation of theforwerd end of ,the hammer 'drill KVVshown in 5 fFigf y5 is at detail of e `slight in e'li,C zttion `end shows the housing for, the tool retainer Y lcomieetion in seetionelelevation thright engles t0 .theselctlon Shown lnFlg 2; and

46 iS a Section Oath@ lili@ 6%@ Of 3f" Fig." 5,V showing ,the elongated Kslot end of ythe housing. e

n Referring to ,the Vdrgnvings vand the illustrntive embodiment of the invention therein sh'oivn, the hammer drill machine may beof any nsuelfor suitable construetior'i"ind hevsuitable control lvalve (not shown) for controlling the movements of the hammer piston 1. `Thelatter is providedjvith the redueedhtunnier end y3, which is adapted io to strike thev end of the tool Steel 51ers isf LuSllfllin this :ela-ss wof itools.4 The Vfront" end of the hammer kdrill machine vserves as `e Niholdr fer the tool steehthe latterV being provided with an enlrg-ed ,shoulder or other ofthe chuok 9 by Awhich rotary. movement is impartedto the tool steel.

.Rotary movement Imay be imparted to the `chiic'kA b ,ny Suitable means, vthere being 4proyi-de a pressure'iuid niotonfo'f, the r0- portion" 1&3 of theeyiinder; Ther mei-,Ori 'is .Lemmer .leoreetiag with 911e', 01" more", rotary .gaaf members werent@ natasha@ in ,the .driafwigrt .allaa'ed symmetrically 'lat onpasitsidestf the vCylinderY end Sand vvo'rkinglvithin .a el'iamber which' is provded'within the yeasing l5, letter constituting :tv part of the housing for the hammer drillmehine.

' The rotary motor frets to turn'th .hllck 9 ltliroughfslideble rednotionmneering, y'the rotary innemen .of the meer eine 'aans- :mitted from the foreseid 'two copeiting geur memberezof the motor through eecene tric transmission Voo'nnevetions to the internal gyrntory 'gelzer ,member 17 of the Reduction gearing.L Ivh'e'E ltteit'ris 4:ilse i Contained "Within th .Caarie 15'i1ageai 'Chahiber 'forivard 'meter chrtmber eind yeeperfeted therefrom by the partition '18.

'filhefinternil gearfmember llhes; engegement with, spur gear rteeth 19 formed upon in enlarged portion of the 'chuck 9, the ltter being mounted lt() turn 'about va, suiteble bearling ,fQlmedupoin' the rfdeed frnt Cylinder end vrBy this" means xrtry.j meyement is imparted from the motor `:.through the intermediate,reliitin lgear 'hand i the Cliuekto the telst'eie'lf" i' i" y The hammer drill machine at its forward @nd iSiaLrQV'idedl Witl the fnt head "2.1, which abuts :against and closes the front ena `of the' @erhmmm @eine 15, tand is kclamped lto the meiner cylinder portion of the meehine Casing by ,suitable tie rods the y,letter beingVvv` provided 'with benring ,Washers .25 ,which bear against ,springs `(,n''nt shOXiIIl) vseated Within lug-like' formations 26,"et opposite sides' of ythe front heed to afford the equireazresiiency,

"i To reteinthe tooljxsteel in the frontendv et Athe mzilehinea tool Asteel 'retainer is Vprovid-@d ,@Qmirsiae ,the yl member V27, Para ly'embreoing .the Atool steel, and the' s'peoed side arme 2S), Ithe latter pivotsilly Yeenneeted tothe tool-steel'liolding portion of the'ha'mnier drill f machine V Yattechin ent to Ithe "frent head, l,so'that 7the Iy'eke"eind itsvside erms may be swung l'lrem"fthe :dotted vline positions-hmm rig. i4 alie., i11.1.1f1.er fsitin thereinlsnotviif' In ,the latter i the' yer@ iijeswifhin vthe pani 'ff-,ire n1 meat? 'and prevaiata'tha dtahrrin i. teol steelfrorn thehueln Whenfthe rretainia ,swung meer toward the .domaine Positll, ihbnaventjreriaits thefwfhdrawal "of "the tool steel, the" enlargement' readily mei-reihe adesivi/@heat ,inminente 1A:

illustrated by the drawings, the retainer may he made o't a rod or the like bent or [tuged into the shape described.

ln order to i'ender the retainer resilient or yieldable and at the same time to provide ttor pivotal connection to the drill machine, the retainer is pivotallyattached to resilient connections mounted Within the front head. Such connections herein comprise at each side of the front head the longitudinally movable plunger member 3l, the forward end of which projects through an opening in the -front head and is thereat connected to one of the side arms. The rear end of each plunger is provided with an enlargement, herein in the form of a nut 33, seated against a compression spring 35, the latter contained within a recess or casing which is presented by an enlargement or formation 37 at the side of the front head. The two such enlargements or housings 3T for the retainer springs are formed at opposite sides of and Within the trout head and at right angles to the enlargements 26 for the `tie rod springs.` Both enlargements 26 and 37 lie Within the marginal limits ot the gear easing l5, the t'ront head covering the frontend of the gear chamber and gear casing and the recess tor the retainer springs opeiinig into the gear chamber. This provides afielatively small front head in which the y various parts are located in a close compact relation lhile any suitable connections may be had between the retainer and the resiliently mounted plungei's 3l, herein the forwardly projectingends of the plungers are formed `,into eyes 39 which are axiallyaligned with `each other, the ends oil the side arms being bent to pass through the eyes so that they are ilulerumed therein. Herein one of the side arms is bent around the eye so as to be coupled thereto, While the opposite arm passes through the eye and is prolonged up at` the side of the hammer tool. presenting a member 4l which maybe utilized both as a handle or lever to force the retainer into `or out of retaining position and at the same time may be employed to lock the retainer.` Itmwill he observed that my construction `provides that the springs 35 hold the side arms firmly against the abutment afforded h the torivard faces ot the enlargements .his prevents the yoke from vibrating relatively to the eyes, which vibration, il pei'- mitted, would, by the hammering action, rapidly Wear the contacting surfaces of the eyes and side arms and `result in breakage. To provide a seat for the side arms and Afurther eliminate Wear and vibration, the forward faces of the enlargements are pro `vided with the grooves or other suitable formations 42 for receiving or supporting the side arms.

The front head is provided with lugs 43 between which therev is presented a groove or seat which receives` the prolongation /1-1 when the retainer is swung into toolretaining position. When it is desired to release the tool, the handle is forced out ot the groove or seat and snapped over one oi the lugs as indicated by dotted lines in Fig. l. lVhen the retainer is to be moved bael; into tool-retaining position, it is swung back into the full-line position shown in Fig. 1 and snapped or forced into the seat, the lugs effectively holding it.

The connection o the retainer to the eyes 39 provides a fulcruming point lwhich forward ol the chuck at or in the vicinity of the enlargement 7 permitting the use ot relatively short side arms for the retainer and giving an eHective leverage to the prolongation l-l, either lor the purpose of locking the retainer or for the purpose of swinging it into or out oit position If desired. the shouldered head 33 ot the plunger member 3l may he riveted or otherwise permanently secured to the plunger and may be oetagonal, round or ot any other :uitahlc shape. To facilitate the asseinlillage ot the retainer parts,the enlargements 3T and the recesses or .spacesl which receive the springs therein are made oi' sullicient size to allow the eyes 39 to ass down into their respective recesses, andP the opening 47 in the front ot the enlargement through which the plunger member 3l passes is in the t'orin of an elongated slot `of sufficient size to take the eye 39. Then the parts are to be assembled, the plungers With the coil sprii'lgs 35 in position are inserted into the recesses of the front head `from the hack thereoil and pressure applied to the enlarged heads ot the plungers to couilviress the springs and torce theeyes 39 through the slots 4:1 until they are projected a sutlicient distance to slip the two retainer yoke arms into the open throat of the two eyes 39. lVhen thus positioned, the pressure is reinoveffl and the springs draw the retainer `volte into the position shown in the drawings.

lVhile I havelierein described for pur "posesof illustration one specific embodiment of the invention, it is to he understood that the same not limited, to the mechanical details herein shown, nor to the form or relative arrangement. ol parts, but that eX- tensive deviations may he made there/trom Without departing from the spirit thereof.

I claim:

l. ln` an apparatusof the class described, a tool steel retainer comprising a yoke with separated side arms, resilient connections for said side arms comprising plungers having enlarged front ends to connect With the side arms, springs engaging said plungers,

housings` for said springs and plungers ses cured to the tool casing and having `openings in the forward ends of suiiicient size to receive said enlarged ends, said springs acting to draw said side arms rearwardly and to hold them resiliently against the forward ends of said housings under sufficient force to prevent substantial vibration of said retainer. 1

2. In a drilling machine, a chuck formed for carrying a drill steel, a retainer for said steel having side arms and a steel engaging portion, ak casing housing 'said chuck formed with forwardly facing abutments, said retainer having transverse portions integral with said side arms, resilient means Vpivotally engaging said transverse r' portions of said retainer and drawing them yieldingly against said abutments with sufticient force to prevent substantial vibration of said retainer, a handle for swinging said retainer into and out of operative position, said handle formed' integrally Vwith saidretainer and having a portion adapted to lie at the side of said casing substantially parallel to said drill steel, and locking means carried by said casing for engaging r said handle and permitting it to yield in f ing said retainer intoand out of operative position, said handle having a portion'lying substantially parallel Ato said drill steel when said retainer is in operative position, and locking means engaging said handle and permitting it to yield in the direction of the length of said drill steel.

el. In a drilling machine, a casing, a pair of members housed bysaid casing, springs for drawing said members rearwardly, a retainer situated eXteriorly of said casing, said retainer having a pair of arms carrying drill steel engaging means, abutments formed by said casing, spring means carried by said members for engaging said arms and acting resiliently to hold said arms pivotallyagainst said abutments with sufficient force to prevent substantial vibration of said retainer.

5. In a drilling machine, acasing. a pair of eye bolts, a retainer having drill steel engaging means and portions at opposite sides thereof pivotally engaged by theeyes of said bolts, springs acting to force said bolts rearwardly, said casing having portions formed with perforations for receiving the shanks of said bolts, said portions of said casing' presenting oppositely facing surfaces respectively serving as abutments for said springs and the portions of said retainer engaged by the eyes of said bolts, said springs acting to hold said portions of said retainer against the abutments with suflicient force to prevent substantial vibration of said retainer.

6. In a drilling machine, a chuck, a front I head'structure, a drill steel carried by said chuck, a drill steel retainer carried by said frontheadstructure, said drill steel retainer having side arms and a yoke, supporting means for said retainer, said supporting means comprising a plun er and spring, said plunger having a hea formed with a perforation and a lateral opening intersecting said perforation whereby said head may be hooked over said retainer, a housing for said plunger and spring having a front wall, and said front wall being perforated to permit said head of said plunger to be passed through said front wall whereby to compress said spring and hook said head over said retainer.

7. In a drilling machine, a chuck formed for carrying a drill steel, a front head structure, a drill steel retainer carried by said front head structure, said drill steel retainer having side arms and a yoke, supporting means for said retainer, said supporting means comprising a plunger and spring,

said plunger having a head formed to hook over said retainer, a housing for said plunger and spring having a front wall, said retainer lying against the forward side of said front wall, said .front wall being perforated to permit said head to be passed 'therethrough for hooking over said retainer, and said plunger being of such length that when said head engages said retainer said spring will be compressed.

8. In a`Y drilling machine, a front head structure, a chuck in said front head structure formed for carryinga drill steel, a drill steel retainerv having side arms and a yoke for engaging said drill steel, said retainer further having transverse lportions and a rearwardly extending handle lever integrallyy formed with one of said transverse portions, said front head structure carrying portions providing forwardly facing surfaces behind said transverse portions and against which said transverse portions rest, plunger members havingy heads engaging said transverse portions, and springs under initial tension located behind said forwardly facing surfaces for drawing said plungers rearwardly.

In testimony whereof, I have signed my naine to this specification.

GEORGE H. GILMAN. 

